# num = 3
# def fun():
#     num = 5
#     print('函数内局部变量num的值：', num)
# fun()
# print('函数外全局变量num的值：', num)

# num = 5
# def fun():
#     global  num
#     num += 1
#     print('函数内num的值：', num)
#     fun()
#     print('函数外num的值：', num)

# def outer():
#     num = 1
#     def inner():
#         nonlocal  num
#         num = 2
#         print('inner函数中num的值', num)
#         inner()
#         print('outer函数中num的值', num)
#         outer()

stu = [{'num': '201801','name':'王五','score': 89},
       {'num': '201802','name':'刘军','score': 95},
       {'num': '201803','name':'李梦','score': 85},]
stu.sort(key=lambda x: x['score'])
for s
